Java生成二维码

第一步

导入依赖包

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<`font style="color:rgb(77, 77, 77)"><font` `face="&quot"><font style="font-size:16px"><dependency>`

<`groupId>com.google.zxing</groupId>`

<`artifactId>core</artifactId>`

<`version>3.1.0</version>`

<`/dependency>`

<`dependency`>

<`groupId>com.google.zxing</groupId>`

<`artifactId>javase</artifactId>`

<`version>3.1.0</version>`

<`/dependency></font></font></font>`

第二步,建立class文件（QRCodeUtils ）

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import java.awt.BasicStroke;

import java.awt.Graphics;

import java.awt.Graphics`2`D;

import java.awt.Image;

import java.awt.Shape;

import java.awt.geom.RoundRectangle`2`D;

import java.awt.`image`.BufferedImage;

import java.io.File;

import java.io.OutputStream;

import java.util.Hashtable;

import java.util.Random;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.BinaryBitmap;

import com.google.zxing.DecodeHintType;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatReader;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.Result;

import com.google.zxing.client.j`2`se.BufferedImageLuminanceSource;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.common.HybridBinarizer;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeUtils {

private static final String CHARSET = "utf-8"`;`

private static final String FORMAT_NAME = "JPG"`;`

/`/ 二维码尺寸   `

private static final int QRCODE_SIZE = 300`;`

/`/ LOGO宽度   `

private static final int WIDTH = 60`;`

/`/ LOGO高度   `

private static final int HEIGHT = 60`;`

private static BufferedImage createImage`(String` `content, String imgPath`,

boolean needCompress`) throws Exception {`

Hashtable`<EncodeHintType, Object>` `hints` `=` `new` `Hashtable<EncodeHintType, Object>();`

hints.put`(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);`

hints.put`(EncodeHintType.CHARACTER_SET, CHARSET);`

hints.put`(EncodeHintType.MARGIN, 1);`

BitMatrix bitMatrix = new MultiFormatWriter`().encode(content`,

BarcodeFormat.QR_CODE`, QRCODE_SIZE,` `QRCODE_SIZE, hints);`

int width = bitMatrix.getWidth`();`

int height = bitMatrix.getHeight`();`

BufferedImage image = new BufferedImage`(width, height`,

BufferedImage.TYPE_INT_RGB`)`;

for (`int x = 0; x` `<` `width; x++) {`

for (`int y = 0; y` `<` `height; y++) {`

image`.setRGB(x,` `y, bitMatrix.get(x, y)` `?` `0xFF`000000

: 0`xFFFFFFFF);`

}

}

if (`imgPath ==` `null ||` `"".equals(imgPath)`) {

return image`;`

}

/`/ 插入图片   `

QRCodeUtils.insertImage`(image, imgPath,` `needCompress)`;

return image`;`

}

/`*`*

* 插入LOGO 

*

* @param source

*            二维码图片 

* @param imgPath

*            LOGO图片地址 

* @param needCompress

*            是否压缩 

* @throws Exception

*`/`

private static void insertImage`(BufferedImage source, String imgPath`,

boolean needCompress`) throws Exception {`

File file = new File`(imgPath)`;

if (`!file.exists()) {`

System.err.println`(""+imgPath+"   该文件不存在！")`;

return`;`

}

Image src = ImageIO.`read(new File(imgPath))`;

int width = src.getWidth`(null)`;

int height = src.getHeight`(null)`;

if (`needCompress)` `{` `// 压缩LOGO   `

if (`width > WIDTH`) {

width = WIDTH;

}

if (`height > HEIGHT`) {

height = HEIGHT;

}

Image image = src.getScaledInstance`(width, height`,

Image.SCALE_SMOOTH`)`;

BufferedImage tag = new BufferedImage`(width, height`,

BufferedImage.TYPE_INT_RGB`)`;

Graphics g = tag`.getGraphics()`;

g.drawImage`(image, 0,` `0, null); /`/ 绘制缩小后的图   

g.dispose`();`

src = image`;`

}

/`/ 插入LOGO   `

Graphics`2D graph` `=` `source.createGraphics();`

int x = (`QRCODE_SIZE - width)` `/` `2;`

int y = (`QRCODE_SIZE - height)` `/` `2;`

graph.drawImage`(src, x,` `y, width,` `height, null);`

Shape shape = new RoundRectangle`2D.Float(x, y,` `width, width,` `6, 6);`

graph.setStroke`(new` `BasicStroke(3f))`;

graph.draw`(shape)`;

graph.dispose`();`

}

/`*`*

* 生成二维码`(内嵌LOGO)` 

*

* @param content

*            内容 

* @param imgPath

*            LOGO地址 

* @param destPath

*            存放目录 

* @param needCompress

*            是否压缩LOGO 

* @throws Exception

*`/`

public static String encode`(String` `content, String imgPath,` `String destPath,`

boolean needCompress`) throws Exception {`

BufferedImage image = QRCodeUtils.createImage`(content, imgPath`,

needCompress`)`;

mkdirs`(destPath)`;

String file = new Random`().nextInt(99999999)+".jpg";`

ImageIO.`write(image,` `FORMAT_NAME, new File(destPath+"/"+file))`;

return file`;`

}

/`*`*

* 当文件夹不存在时，mkdirs会自动建立多层目录，区别于mkdir．`(mkdir若是父目录不存在则会抛出异常)` 

* @`date 2013-12-11 上午10:16:`36 

* @param destPath 存放目录 

*`/`

public static void mkdirs`(String destPath) {`

File file =`new File(destPath);`

/`/当文件夹不存在时，mkdirs会自动建立多层目录，区别于mkdir．(mkdir若是父目录不存在则会抛出异常)`   

if (`!file.exists()` `&& !file.isDirectory()`) {

file`.mkdirs()`;

}

}

/`*`*

* 生成二维码`(内嵌LOGO)` 

*

* @param content

*            内容 

* @param imgPath

*            LOGO地址 

* @param destPath

*            存储地址 

* @throws Exception

*`/`

public static void encode`(String` `content, String imgPath,` `String destPath)`

throws Exception {

QRCodeUtils.encode`(content, imgPath,` `destPath, false);`

}

/`*`*

* 生成二维码 

*

* @param content

*            内容 

* @param destPath

*            存储地址 

* @param needCompress

*            是否压缩LOGO 

* @throws Exception

*`/`

public static void encode`(String` `content, String destPath`,

boolean needCompress`) throws Exception {`

QRCodeUtils.encode`(content, null,` `destPath, needCompress);`

}

/`*`*

* 生成二维码 

*

* @param content

*            内容 

* @param destPath

*            存储地址 

* @throws Exception

*`/`

public static void encode`(String` `content, String destPath`) throws Exception {

QRCodeUtils.encode`(content, null,` `destPath, false);`

}

/`*`*

* 生成二维码`(内嵌LOGO)` 

*

* @param content

*            内容 

* @param imgPath

*            LOGO地址 

* @param output

*            输出流 

* @param needCompress

*            是否压缩LOGO 

* @throws Exception

*`/`

public static void encode`(String` `content, String imgPath`,

OutputStream output`, boolean needCompress`) throws Exception {

BufferedImage image = QRCodeUtils.createImage`(content, imgPath`,

needCompress`)`;

ImageIO.`write(image,` `FORMAT_NAME, output);`

}

/`*`*

* 生成二维码 

*

* @param content

*            内容 

* @param output

*            输出流 

* @throws Exception

*`/`

public static void encode`(String` `content, OutputStream output`)

throws Exception {

QRCodeUtils.encode`(content, null,` `output, false);`

}

/`*`*

* 解析二维码 

*

* @param file

*            二维码图片 

* @`return`

* @throws Exception

*`/`

public static String decode`(File` `file) throws Exception {`

BufferedImage image`;`

image = ImageIO.`read(file);`

if (`image ==` `null) {`

return null;

}

BufferedImageLuminanceSource source = new BufferedImageLuminanceSource`(`

image`)`;

BinaryBitmap bitmap = new BinaryBitmap`(new` `HybridBinarizer(source));`

Result result`;`

Hashtable`<DecodeHintType, Object>` `hints` `=` `new` `Hashtable<DecodeHintType, Object>();`

hints.put`(DecodeHintType.CHARACTER_SET, CHARSET);`

result = new MultiFormatReader`().decode(bitmap,` `hints)`;

String resultStr = result`.getText()`;

return resultStr;

}

/`*`*

* 解析二维码 

*

* @param path

*            二维码图片地址 

* @`return`

* @throws Exception

*`/`

public static String decode`(String` `path) throws Exception {`

return QRCodeUtils.decode`(new` `File(path));`

}

}

第三步,Controller层

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@AuthIgnore

@GetMapping`("QRCode")`

public R QRCode`(`) {

String text = "I love you"`; //生成二维码的内容`

String logoPath = "D:\\img\\1575892281966maxresdefault.jpg"`; //二维码的logo图片`

String destPath = "D:\\img"`; //生成的二维码存储本地的地址`

try {

System.out.println`(QRCodeUtils.encode(text, logoPath,` `destPath, true))`;

} catch (`Exception e`) {

/`/ TODO Auto-generated catch block`

e.printStackTrace`();`

}

return R.ok`().put("msg",` `"成功")`;

}

第四步 使用Postman访问接口

生成成功